ExtensionType: ExtensionType class
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ExtensionType R Documentation
ExtensionType class
Description
ExtensionType class
Methods
The ExtensionType class inherits from DataType, but also defines
extra methods specific to extension types:
-
$storage_type(): Returns the underlying DataType used to store
values.
-
$storage_id(): Returns the Type identifier corresponding to the
$storage_type().
-
$extension_name(): Returns the extension name.
-
$extension_metadata(): Returns the serialized version of the extension
metadata as a raw() vector.
-
$extension_metadata_utf8(): Returns the serialized version of the
extension metadata as a UTF-8 encoded string.
-
$WrapArray(array): Wraps a storage Array into an ExtensionArray
with this extension type.
In addition, subclasses may override the following methos to customize
the behaviour of extension classes.
-
$deserialize_instance(): This method is called when a new ExtensionType
is initialized and is responsible for parsing and validating
the serialized extension_metadata (a raw() vector)
such that its contents can be inspected by fields and/or methods
of the R6 ExtensionType subclass. Implementations must also check the
storage_type to make sure it is compatible with the extension type.
-
$as_vector(extension_array): Convert an Array or ChunkedArray to an R
vector. This method is called by as.vector() on ExtensionArray
objects, when a RecordBatch containing an ExtensionArray is
converted to a data.frame(), or when a ChunkedArray (e.g., a column
in a Table) is converted to an R vector. The default method returns the
converted storage array.
-
$ToString() Return a string representation that will be printed
to the console when this type or an Array of this type is printed.
arrow documentation built on Nov. 25, 2023, 1:09 a.m.
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| ExtensionType | R Documentation |
ExtensionType class
Description
ExtensionType class
Methods
The ExtensionType class inherits from DataType, but also defines
extra methods specific to extension types:
-
$storage_type(): Returns the underlying DataType used to store values. -
$storage_id(): Returns the Type identifier corresponding to the$storage_type(). -
$extension_name(): Returns the extension name. -
$extension_metadata(): Returns the serialized version of the extension metadata as araw()vector. -
$extension_metadata_utf8(): Returns the serialized version of the extension metadata as a UTF-8 encoded string. -
$WrapArray(array): Wraps a storage Array into an ExtensionArray with this extension type.
In addition, subclasses may override the following methos to customize the behaviour of extension classes.
-
$deserialize_instance(): This method is called when a new ExtensionType is initialized and is responsible for parsing and validating the serialized extension_metadata (araw()vector) such that its contents can be inspected by fields and/or methods of the R6 ExtensionType subclass. Implementations must also check thestorage_typeto make sure it is compatible with the extension type. -
$as_vector(extension_array): Convert an Array or ChunkedArray to an R vector. This method is called byas.vector()on ExtensionArray objects, when a RecordBatch containing an ExtensionArray is converted to adata.frame(), or when a ChunkedArray (e.g., a column in a Table) is converted to an R vector. The default method returns the converted storage array. -
$ToString()Return a string representation that will be printed to the console when this type or an Array of this type is printed.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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